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Fair Value of Derivative and Other Financial Instruments, Derivative Balance Sheet Information (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2011
Dec. 31, 2010
Derivatives, Fair Value [Line Items]  
Commodity derivative instruments, Current assets$ 3,716$ 15,999
Commodity derivative instruments, Deferred charges2475,264
Commodity derivative instruments, Current liabilities(1,746)(31,407)
Commodity derivative instruments, Long-term liabilities(1,913)(12,831)
Public Service Company of New Mexico [Member] | Maximum [Member] | Commodity Contract [Member] | Fuel and Purchased Power Adjustment Clause [Member]
  
Derivatives, Fair Value [Line Items]  
Commodity derivative instruments, Deferred charges100 
Commodity derivative instruments, Long-term liabilities(100) 
Public Service Company of New Mexico [Member] | Commodity Contract [Member] | Fuel and Purchased Power Adjustment Clause [Member]
  
Derivatives, Fair Value [Line Items]  
Commodity derivative instruments, Current assets800600
Commodity derivative instruments, Current liabilities(400) 
Public Service Company of New Mexico [Member] | Commodity Contract [Member] | Economic hedges [Member]
  
Derivatives, Fair Value [Line Items]  
Commodity derivative instruments, Current assets3,7161,443
Commodity derivative instruments, Deferred charges2470
Commodity derivative instruments, Assets3,9631,443
Commodity derivative instruments, Current liabilities(1,746)(3,110)
Commodity derivative instruments, Long-term liabilities(1,913)(2,009)
Commodity derivative instruments, Liabilities(3,659)(5,119)
Commodity derivative instruments, Net304(3,676)
Commodity Contract [Member] | Economic hedges [Member]
  
Derivatives, Fair Value [Line Items]  
Commodity derivative instruments, Current assets32,16815,999
Commodity derivative instruments, Deferred charges9,0645,264
Commodity derivative instruments, Assets41,23221,263
Commodity derivative instruments, Current liabilities(41,018)(31,407)
Commodity derivative instruments, Long-term liabilities(16,373)(12,831)
Commodity derivative instruments, Liabilities(57,391)(44,238)
Commodity derivative instruments, Net(16,159)(22,975)
Trading transactions [Member]
  
Derivatives, Fair Value [Line Items]  
Number of Derivative Transactions00
Cash flow hedges [Member]
  
Derivatives, Fair Value [Line Items]  
Number of Derivative Transactions00
Public Service Company of New Mexico [Member]
  
Derivatives, Fair Value [Line Items]  
Commodity derivative instruments, Current assets3,7161,443
Commodity derivative instruments, Deferred charges2470
Commodity derivative instruments, Current liabilities(1,746)(3,110)
Commodity derivative instruments, Long-term liabilities$ (1,913)$ (2,009)